spring与jbpm整合时Action中使用spring注入service方法

在一个节点中用到action，action又要用到spring提供的service方法怎么做？

在spring的配置文件中：

<beans>
 <!-- Spring bean visible inside jBPM processed -->
 <bean id="jbpmAction" class="org.MyJbpmActionHandler" singleton="true">
   <property name="prop" ref="anotherBean"/>
   ...
 </bean>
..
</beans>

jbpm的action按平常编写：

public class JbpmAction implements ActionHandler {    
         
 private UserService userService;    
    
     public void execute(ExecutionContext executionContext) throws Exception {    
          userservice.getUser();  
     }       
     
     public void setUserService(UserService  userService){  
              this.userService=userService;  
    }  
 }  

在jbpm的流程定义文件里：

<?xml version="1.0" encoding="UTF-8"?>
<process-definition name="simpleWorkflow">

 <start-state>
  <transition to="myState">
  </transition>
 </start-state> 

 <state name="myState">
  <transition to="end">
   <action name="myAction" config-type="bean" class="org.springmodules.workflow.jbpm31.JbpmHandlerProxy">
    <targetBean>jbpmAction</targetBean>
   </action>
  </transition>
 </state>

 <end-state name="end"/>

</process-definition>